Sym dd50 build!!

tabs808 · Post by **tabs808** » Mon Apr 09, 2012 1:35 pm

It doesnt matter if you dont have any problems with it now, trust me, just swap it out.
If your gonna insgall new bearings and seals, you might as well install a new crank, port match the boost port, and open up the intake port. Stock intake port on dd50 block is smaller than stock af16 intake port.

Madman · Post by **Madman** » Mon Apr 09, 2012 10:45 pm

I'm defiantly going to port it otherwise no point to crack the crank case!!

Madman · Post by **Madman** » Tue Apr 10, 2012 6:48 am

Got one of these on the way, with a stronger connecting rod for bbk!

Still waiting on:
75cc bbk
Crank bearings, top end bearing
Crank seals
Oil pump plug
Crank puller, bearing puller, flywheel puller,
New fan
New drive belt

It will be a new engine when I'm finished all that will remain is the crankcase!

paulpauly7 · Post by **paulpauly7** » Tue Apr 10, 2012 3:27 pm

is that from yahoo auctions?
how much?
mini stroker?

Madman · Post by **Madman** » Wed Apr 11, 2012 12:22 am

It's from Taiwan and I found it on alibaba.com It's not a mini stroker it's a regular 41.4 stroke

It is about 60$us delivered, they have a stroker for about 100$ delivered but I don't know if it would match the port timing on the bbk I baught so I'm gonna go stock.

Madman · Post by **Madman** » Wed Apr 11, 2012 11:51 am

Got that ordered and was reading a thread about a nice build by burnt toast and was wondering. I have a OKO28mm carb already, Baught it and never used it!

Would I be able to use it on this build or would it be too big?

I currently have a 21mm OKO

I'm going to port its intake and boost to match the bbk which is better!

Don't say 24mm cause I haven't got one?

Which is better?

Madman · Post by **Madman** » Thu Apr 12, 2012 2:50 am

Parts started arriving today!!

Fan top end bearing and crank seals.

tabs808 · Post by **tabs808** » Sat Apr 14, 2012 6:27 am

Is that another stock dd50 crank that you bought? You shoulda jist got a stock af16 one. Or a stock full counter. Ive had bad experiences with stock dd cranks, where the two halves loosen up and con rod falls out or the crank breaks right by the crank seal on the pulley side.

If you have the 28mm oko, it should be good already. Youre porting the block anyways, just jet it correctly and you should be safe.

evilone · Post by **evilone** » Sat Apr 14, 2012 10:01 am

Madman wrote:I have a OKO28mm carb already.

Would I be able to use it on this build or would it be too big?

I currently have a 21mm OKO.

Use the 21mm.

Madman · Post by **Madman** » Sat Apr 14, 2012 8:07 pm

It's not the stock crank it's designed for tuned engines. Just the same stroke.

Ok that's 1 for 28mm

And 1for 21mm

Downsouthdio · Post by **Downsouthdio** » Sat Apr 14, 2012 11:57 pm

21 is reAl simple to tune.. 28 will make more power up top.. Jus a lil

Downsouthdio · Post by **Downsouthdio** » Sat Apr 14, 2012 11:58 pm

I say 21

Madman · Post by **Madman** » Sun Apr 15, 2012 2:48 am

Thats 2 for 21mm

1for 28mm

paulpauly7 · Post by **paulpauly7** » Sun Apr 15, 2012 2:51 am

id say 21 better for inner city traffic and easyer to tune the 28 if your a highway runner

Madman · Post by **Madman** » Sun Apr 15, 2012 3:51 am

Well I drive in the city! Tokyo!! And scoots are not allowed on the highway here so that = 21mm

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Sym dd50 build!!

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Sym dd50 build!!

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Sym dd50 build!!